| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 439946 |
2021-07-01T09:19:47 Z |
dongliu0426 |
Feast (NOI19_feast) |
C++14 |
|
439 ms |
20304 KB |
#include <bits/stdc++.h>
using namespace std;
#define N 300000
#define INF 0x3f3f3f3f3f3f3f3f
int n, k, a[N + 1];
pair<long double, int> dp[N + 1][2];
template<class T, class U> T lastTrue(T lo, T hi, U f) {
assert(lo <= hi); --lo; /* assuming f is decreasing */
while (lo < hi) { /* find last index such that f is true */
T mid = lo + (hi - lo + 1) / 2;
f(mid) ? lo = mid : hi = mid - 1;
} return lo;
}
int main() {
scanf("%d%d", &n, &k);
for (int i = 1; i <= n; ++i)
scanf("%d", a + i);
auto check = [&](long double penalty) {
dp[0][0] = {0, 0}, dp[0][1] = {-INF, 0};
for (int i = 1; i <= n; ++i) {
pair<long double, int> last = max(dp[i - 1][0], dp[i - 1][1]);
dp[i][0] = max(make_pair(last.first - penalty, last.second + 1), last);
dp[i][1] = max(make_pair(dp[i - 1][1].first + a[i], dp[i - 1][1].second),
make_pair(dp[i - 1][0].first + a[i] - penalty, dp[i - 1][0].second + 1));
}
return max(dp[n][0], dp[n][1]).second >= k;
};
long double lower = 0, upper = INF;
for (int it = 0; it < 50; ++it) {
long double mid = (lower + upper) / 2;
if (check(mid)) {
lower = mid;
} else {
upper = mid;
}
}
long double penalty = lower;
check(penalty);
printf("%lld\n", (long long) round(penalty * k + max(dp[n][0], dp[n][1]).first));
}
Compilation message
feast.cpp: In function 'int main()':
feast.cpp:19:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
19 | scanf("%d%d", &n, &k);
| ~~~~~^~~~~~~~~~~~~~~~
feast.cpp:21:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
21 | scanf("%d", a + i);
| ~~~~~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
390 ms |
19616 KB |
Output is correct |
| 2 |
Correct |
439 ms |
19924 KB |
Output is correct |
| 3 |
Correct |
400 ms |
20208 KB |
Output is correct |
| 4 |
Correct |
419 ms |
20072 KB |
Output is correct |
| 5 |
Correct |
402 ms |
19968 KB |
Output is correct |
| 6 |
Correct |
382 ms |
19656 KB |
Output is correct |
| 7 |
Correct |
408 ms |
19572 KB |
Output is correct |
| 8 |
Correct |
396 ms |
20036 KB |
Output is correct |
| 9 |
Correct |
383 ms |
19680 KB |
Output is correct |
| 10 |
Correct |
384 ms |
19912 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
341 ms |
19780 KB |
Output is correct |
| 2 |
Correct |
358 ms |
20304 KB |
Output is correct |
| 3 |
Correct |
341 ms |
19732 KB |
Output is correct |
| 4 |
Correct |
348 ms |
19888 KB |
Output is correct |
| 5 |
Correct |
346 ms |
19652 KB |
Output is correct |
| 6 |
Correct |
350 ms |
19712 KB |
Output is correct |
| 7 |
Correct |
360 ms |
20228 KB |
Output is correct |
| 8 |
Correct |
358 ms |
20232 KB |
Output is correct |
| 9 |
Correct |
358 ms |
19496 KB |
Output is correct |
| 10 |
Correct |
358 ms |
20100 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
392 ms |
19916 KB |
Output is correct |
| 2 |
Correct |
390 ms |
19756 KB |
Output is correct |
| 3 |
Correct |
374 ms |
20036 KB |
Output is correct |
| 4 |
Correct |
387 ms |
19652 KB |
Output is correct |
| 5 |
Correct |
368 ms |
19952 KB |
Output is correct |
| 6 |
Correct |
374 ms |
20076 KB |
Output is correct |
| 7 |
Correct |
397 ms |
20160 KB |
Output is correct |
| 8 |
Correct |
377 ms |
19952 KB |
Output is correct |
| 9 |
Correct |
376 ms |
20196 KB |
Output is correct |
| 10 |
Correct |
369 ms |
20132 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Correct |
1 ms |
204 KB |
Output is correct |
| 3 |
Correct |
1 ms |
204 KB |
Output is correct |
| 4 |
Correct |
1 ms |
204 KB |
Output is correct |
| 5 |
Correct |
1 ms |
204 KB |
Output is correct |
| 6 |
Correct |
1 ms |
204 KB |
Output is correct |
| 7 |
Correct |
1 ms |
204 KB |
Output is correct |
| 8 |
Correct |
1 ms |
204 KB |
Output is correct |
| 9 |
Correct |
1 ms |
204 KB |
Output is correct |
| 10 |
Correct |
1 ms |
204 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Correct |
1 ms |
204 KB |
Output is correct |
| 3 |
Correct |
1 ms |
204 KB |
Output is correct |
| 4 |
Correct |
1 ms |
204 KB |
Output is correct |
| 5 |
Correct |
1 ms |
204 KB |
Output is correct |
| 6 |
Correct |
1 ms |
204 KB |
Output is correct |
| 7 |
Correct |
1 ms |
204 KB |
Output is correct |
| 8 |
Correct |
1 ms |
204 KB |
Output is correct |
| 9 |
Correct |
1 ms |
204 KB |
Output is correct |
| 10 |
Correct |
1 ms |
204 KB |
Output is correct |
| 11 |
Correct |
1 ms |
204 KB |
Output is correct |
| 12 |
Correct |
1 ms |
204 KB |
Output is correct |
| 13 |
Correct |
1 ms |
204 KB |
Output is correct |
| 14 |
Correct |
1 ms |
204 KB |
Output is correct |
| 15 |
Correct |
1 ms |
204 KB |
Output is correct |
| 16 |
Correct |
1 ms |
204 KB |
Output is correct |
| 17 |
Correct |
1 ms |
204 KB |
Output is correct |
| 18 |
Correct |
1 ms |
204 KB |
Output is correct |
| 19 |
Correct |
1 ms |
204 KB |
Output is correct |
| 20 |
Correct |
1 ms |
204 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Correct |
1 ms |
204 KB |
Output is correct |
| 3 |
Correct |
1 ms |
204 KB |
Output is correct |
| 4 |
Correct |
1 ms |
204 KB |
Output is correct |
| 5 |
Correct |
1 ms |
204 KB |
Output is correct |
| 6 |
Correct |
1 ms |
204 KB |
Output is correct |
| 7 |
Correct |
1 ms |
204 KB |
Output is correct |
| 8 |
Correct |
1 ms |
204 KB |
Output is correct |
| 9 |
Correct |
1 ms |
204 KB |
Output is correct |
| 10 |
Correct |
1 ms |
204 KB |
Output is correct |
| 11 |
Correct |
1 ms |
204 KB |
Output is correct |
| 12 |
Correct |
1 ms |
204 KB |
Output is correct |
| 13 |
Correct |
1 ms |
204 KB |
Output is correct |
| 14 |
Correct |
1 ms |
204 KB |
Output is correct |
| 15 |
Correct |
1 ms |
204 KB |
Output is correct |
| 16 |
Correct |
1 ms |
204 KB |
Output is correct |
| 17 |
Correct |
1 ms |
204 KB |
Output is correct |
| 18 |
Correct |
1 ms |
204 KB |
Output is correct |
| 19 |
Correct |
1 ms |
204 KB |
Output is correct |
| 20 |
Correct |
1 ms |
204 KB |
Output is correct |
| 21 |
Correct |
4 ms |
332 KB |
Output is correct |
| 22 |
Correct |
3 ms |
332 KB |
Output is correct |
| 23 |
Correct |
3 ms |
332 KB |
Output is correct |
| 24 |
Correct |
3 ms |
332 KB |
Output is correct |
| 25 |
Correct |
3 ms |
332 KB |
Output is correct |
| 26 |
Correct |
3 ms |
332 KB |
Output is correct |
| 27 |
Correct |
4 ms |
436 KB |
Output is correct |
| 28 |
Correct |
4 ms |
332 KB |
Output is correct |
| 29 |
Correct |
3 ms |
332 KB |
Output is correct |
| 30 |
Correct |
3 ms |
332 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
390 ms |
19616 KB |
Output is correct |
| 2 |
Correct |
439 ms |
19924 KB |
Output is correct |
| 3 |
Correct |
400 ms |
20208 KB |
Output is correct |
| 4 |
Correct |
419 ms |
20072 KB |
Output is correct |
| 5 |
Correct |
402 ms |
19968 KB |
Output is correct |
| 6 |
Correct |
382 ms |
19656 KB |
Output is correct |
| 7 |
Correct |
408 ms |
19572 KB |
Output is correct |
| 8 |
Correct |
396 ms |
20036 KB |
Output is correct |
| 9 |
Correct |
383 ms |
19680 KB |
Output is correct |
| 10 |
Correct |
384 ms |
19912 KB |
Output is correct |
| 11 |
Correct |
341 ms |
19780 KB |
Output is correct |
| 12 |
Correct |
358 ms |
20304 KB |
Output is correct |
| 13 |
Correct |
341 ms |
19732 KB |
Output is correct |
| 14 |
Correct |
348 ms |
19888 KB |
Output is correct |
| 15 |
Correct |
346 ms |
19652 KB |
Output is correct |
| 16 |
Correct |
350 ms |
19712 KB |
Output is correct |
| 17 |
Correct |
360 ms |
20228 KB |
Output is correct |
| 18 |
Correct |
358 ms |
20232 KB |
Output is correct |
| 19 |
Correct |
358 ms |
19496 KB |
Output is correct |
| 20 |
Correct |
358 ms |
20100 KB |
Output is correct |
| 21 |
Correct |
392 ms |
19916 KB |
Output is correct |
| 22 |
Correct |
390 ms |
19756 KB |
Output is correct |
| 23 |
Correct |
374 ms |
20036 KB |
Output is correct |
| 24 |
Correct |
387 ms |
19652 KB |
Output is correct |
| 25 |
Correct |
368 ms |
19952 KB |
Output is correct |
| 26 |
Correct |
374 ms |
20076 KB |
Output is correct |
| 27 |
Correct |
397 ms |
20160 KB |
Output is correct |
| 28 |
Correct |
377 ms |
19952 KB |
Output is correct |
| 29 |
Correct |
376 ms |
20196 KB |
Output is correct |
| 30 |
Correct |
369 ms |
20132 KB |
Output is correct |
| 31 |
Correct |
1 ms |
204 KB |
Output is correct |
| 32 |
Correct |
1 ms |
204 KB |
Output is correct |
| 33 |
Correct |
1 ms |
204 KB |
Output is correct |
| 34 |
Correct |
1 ms |
204 KB |
Output is correct |
| 35 |
Correct |
1 ms |
204 KB |
Output is correct |
| 36 |
Correct |
1 ms |
204 KB |
Output is correct |
| 37 |
Correct |
1 ms |
204 KB |
Output is correct |
| 38 |
Correct |
1 ms |
204 KB |
Output is correct |
| 39 |
Correct |
1 ms |
204 KB |
Output is correct |
| 40 |
Correct |
1 ms |
204 KB |
Output is correct |
| 41 |
Correct |
1 ms |
204 KB |
Output is correct |
| 42 |
Correct |
1 ms |
204 KB |
Output is correct |
| 43 |
Correct |
1 ms |
204 KB |
Output is correct |
| 44 |
Correct |
1 ms |
204 KB |
Output is correct |
| 45 |
Correct |
1 ms |
204 KB |
Output is correct |
| 46 |
Correct |
1 ms |
204 KB |
Output is correct |
| 47 |
Correct |
1 ms |
204 KB |
Output is correct |
| 48 |
Correct |
1 ms |
204 KB |
Output is correct |
| 49 |
Correct |
1 ms |
204 KB |
Output is correct |
| 50 |
Correct |
1 ms |
204 KB |
Output is correct |
| 51 |
Correct |
4 ms |
332 KB |
Output is correct |
| 52 |
Correct |
3 ms |
332 KB |
Output is correct |
| 53 |
Correct |
3 ms |
332 KB |
Output is correct |
| 54 |
Correct |
3 ms |
332 KB |
Output is correct |
| 55 |
Correct |
3 ms |
332 KB |
Output is correct |
| 56 |
Correct |
3 ms |
332 KB |
Output is correct |
| 57 |
Correct |
4 ms |
436 KB |
Output is correct |
| 58 |
Correct |
4 ms |
332 KB |
Output is correct |
| 59 |
Correct |
3 ms |
332 KB |
Output is correct |
| 60 |
Correct |
3 ms |
332 KB |
Output is correct |
| 61 |
Correct |
404 ms |
19736 KB |
Output is correct |
| 62 |
Correct |
399 ms |
20164 KB |
Output is correct |
| 63 |
Correct |
376 ms |
19780 KB |
Output is correct |
| 64 |
Incorrect |
401 ms |
20040 KB |
Output isn't correct |
| 65 |
Halted |
0 ms |
0 KB |
- |
